Ezra 3:8

Now in the second year of their coming unto the Beis HaElohim at Yerushalayim, in the second month, began Zerubavel ben Sh'altiel, and Yeshua ben Yotzadak, and the she'ar (remnant) of their brethren the kohanim and the Levi'im, and all they that were come out of the captivity unto Yerushalayim; and appointed the Levi'im, from twenty years old and upward, to set forward the melechet Beis HASHEM (work of the construction of the Beis Hamikdash).